Safety appliance for elevators.



No. 866,117. PATENTBD SEPT. 17, 1907.

A. L. EDMISTON.

SAFETY APPLIANCE FOR ELEVATORS.

APPLICATION FILED JAN. 30. 1907.

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No. 866,117. PATENTED SEPT. 17, 1907. A. L. EDMISTON. SAFETY APPLIANCE FOR ELEVATORS.

APPLICATION FILED JAN. 30, 1907.

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' ARCH L. EDMISTON,

OF OKLAHOMA, OKLAHOMA TERRITORY,

SAFETY APPLIANCE FOR ELEVATORS.

Specification of Letters Patent.

Patented Sept. 1'7, 1907.

Application filed January 30, 1907. Serial No. 354,870.

To all whom it may concern:

Be it known that I, ARCHL. EDMISTON, a citizen of the United States, residing at Oklahoma city, in the county of Oklahoma and Territory of Oklahoma, have invented certain new and useful Improvements in Safety Appliances for Elevators, of which the following is a specification.

This invention is a safety appliance for elevators, and more particularly that kind consisting of a beam to which the hoisting cable is attached, rack engaging catches, and a connection between the beam and the catches for actuating the latter when the hoisting cable breaks or the strain thereon is removed, thus checking the descent of the cage or car.

The object of the invention is to provide a safety appliance of this kind embodying simplicity of construction, and also one which is prompt and certain in action.

In the accompanying drawing, Figure 1 is an elevation showing the normal position of the parts. Fig. 2 is a plan view. Fig. 3 is an elevation showing the position of the parts when the hoisting cable breaks or when there is no strain thereon. Fig. 4 is a detail in perspective. 7

Referring specifically to the drawing, 10 denotes an ordinary elevator cage or car which slides between vertical guide-rails 11 as usual. The cage carries shoes 12 engaging opposite sides of the rails for holding the car in position and preventing lateral displacement. In the guide-rails are recesses 13 which form a rack which is engageable by the belts or catches to be hereinafter described.

To a bed-plate 14 secured to the top of the car, are fastened loops 15 whereby the car is suspended from a cross-beam 16 to which the hoisting cable 17 is attached in any suitable manner. The loops pass around the cross-beam near its ends. Adjacent the ends of the cross-beam are standards 18. The crossbeam is slidable up and down in the loops, its upward movement being limited by the upper ends of said loops, and its downward movement by the standards. To the bottom of the cross-beam is secured a leaispring 19 the free ends of which extend under the standards.

The cage carries horizontally sliding belts or catches 20 which work under straps 21 secured to the bedplate 1 1. The bolts are actuated by the cross-beam 16 in a manner to be hereinafter described, they being connected to said beam by links 22.

When the cable is intact the parts will be in the position shown in Fig. 1, the strain on the cable bringing the cross-beam to the upper end of the loop. With the cross-beam in this position the catches 20 are.

drawn inwardly to clear the rack 13. If the cable breaks, or the strain thereon is removed, the spring 19 immediately pulls the cross-beam downwardly to the standards 18 as shown in Fig. 3. This downward movement of the beam, through the links 22, pushes the catches 20 outwardly into engagement with the rack 13 whereby the descent of the cage will be promptly checked. The downward movement of the beam is stopped by the standards 18 which prevents excessive outward movement of the catches.

The loops 15, besides sustaining the weight of the cage also serve to guide the movement of the cross beam.

The parts herein describedare reliable in operation and by reason of their simplicity of construction they are not liable to get out of order.

I claim The combination with an elevator cage and vertical guide-rails therefor having racks, of suspension loops on the cage, a cross-beam slidable up and down in the loops, standards rising from the cage under the cross-beam to limit the downward movement thereof, a hoisting cable attached to the beam, catches carried by the car and adapted to engage the aforesaid racks, a connection between said catches and the crossbeam, and a spring secured to the under side of the beam and having its free ends extending under the aforesaid standards, to lower the crossheam in the loops and actuate the catches when the lifting strain on said beam is removed.

In testimony whereof I aflix my signature, in presence of two witnesses.

ARCH L. EDMISTON.

Witnesses ToM. F. MECHAN, .TNo. H. SHIRK. 

